On the section of the advanced security features, you can block, disable or customize connection types for users.
Block Standard RDP Clients
Select the “Yes” value if you wish to deny access to standard RDP clients such as mstsc to your users.
Disable existing sessions web listing
This listing is required for Load-Balancing Sticky Sessions feature and is enabled by default. If you wish to disable it, select the “No” value on this window, then click on save:
No Web for Admins
Disable the Web Portal for Administrators by selecting the “Yes” value:
Block WAN RDP clients
Deny access from standard RDP clients connected from outside the LAN by selecting the “Yes” value.
Only Web Portal
Make Web Portal access mandatory for every user by selecting the “yes” value.
Only Web Portal for Users
Only Users with Applications
Whitelist Admins without Applications
Allow access for admins even if they do not have any assigned application and “Only Users with Applications” is enabled. This advanced security features is enabled by default. If you wish to disable it, select the “No” value on this window, then click on save: